//定时器
//ul- margin-left--
//当前margin-left <= -2032px 重置为0

setInterval(function(){
    var ulObj =  document.querySelector('.hot ul')
    var marginLeft = parseInt(ulObj.style.marginLeft)
    marginLeft--
    if(marginLeft <= -2032){
        ulObj.style.marginLeft = '0px'
    }else{
        ulObj.style.marginLeft =marginLeft + 'px'
    }
},10)